Carburetor



F. E. ASELTINE.

CARBURETOR.

I. APPLICATION FILED FEB. 2. 1916. 1,422,329, Patented July 11, 1922.

UNITED STATES PATENT OFFICE.

FRED E. ASEL'IINE, or n -rnorr, MICHIGAN, ASSIGNOR r0 CADILLAC moron can COMPANY, or DETROIT, MICHIGAN, A CORPORATION or MICHIGAN.

CARIBURETOB.

Specification of Letters Patent.

Patented July 1 1, 1922.

Application filed February 2,1916 Serial No. 75,641.

To all whom it may camera:

Be it known that I, FRED E. AsnL'rINE, a citizen of the United States,ancl resident of Detroit, Wayne County Stateof Michi an, have invented certain new and useful" mproveinents in Carburetors, of whichth following is a specification.

This invention relates to hydrocarbon motors, and particularly tocarburetors or fuel mixing devices therefor.

The invention consists essentially of the novel arrangement of a floating deflector ring adjacent the fuel nozzle whereby an efli'cient and simple means is provided for controlling thequality of mixture produced under varying operating conditions; a means is provided for increasing th'e velocity of the air passing in close proximity to the fuel nozzle when the quantity ofair passing through the throttle is reatly diminished. such as when the throttle is almost closed. and a means isprovided for enrichingthe mixture when the thi'ottleis in an almost closed position. said means having substantially no effect in qualifyin the mixture after the throttle has been slig t'ly openedi These, and other objects, will appearfrom the following description. taken in connection with the accompanying drawings, which form a part of this specification. and in fwhich:

" Figure 1 is a vertical section through the carburetor, embodying a preferred form of this invention;

Figure 2 IS a transverse section substantially on the line 2-2 ofFigure 1;

Referring to the drawings. 10 represents a carburetor body. comprising a downwardly extending tube 11. forming a guide for a slidable sleeve valve 12. which is mounted therein. The carburetor body is also provided with a pair of oppositely arranged lateral ports 13. forming air intakes for the carburetor. A diaphragm 15 forms a lower wall of the carburetor chamber and the upper wall or top of the float chamber.

and is provided with a depressed portion 16 and upwardlyextending-flanged portions 17 p'rovidedwith' lateral primary air ports 18. A fuel no'zzle 19,pro\*idedwith a mouth20 and intake "port 21, is shown as formed integral with the diaphragm 15. The member 15 is also provided with a threaded nipple 22, to'which a fuel feed pipe, not shown, may be connected, and-a passage 23 which isin communication with-said nipple, is adapted to be controlledby a'nylsuitable valve mechanism,"suchas 23', w ich' may be operated by the usual float 1nernber-24 arranged in the float chaitlber. The float bowl or shell 25 may be secured in position by means of a wing nut 26. A rot-aitable mixing or strangle tube 27, which may be tapered downwardly, and is provided with downwardlyextending flanges 28 and ports29, adapted to be brought into registration with ports 18', may beproperly seated on the' diaphragm 15. The mixing tube is also providedat its lower end with an inturned flange or lipBO', havin bevelled edge 30, which is substantially in line'with a ring, which will be more particularly described hereinafter. The usual butterfly throttle 29 may be arranged on 'a shaft 30, which may be mounted in'th'e carburetor body 10 and is adapted to be controlledby the usual It will be noted that the sleeve valve 12 is provided with an integrally formedcage 32. having a downwardly extending portion 33, a lifting plate 84, to which a deflector or choke ring 35 having struck up clips 36. is secured.

Having thus described the general construction and arrangement of parts, the operation of the carburetor will be understood as follows: assuming the throttle to be substantiallv the position illustrated in Figure 1. the sleeve valve 12 will be in the position shown in dotted lines, and ii the handle 37, which is formed on the rotatable tube 27, which is adapted to be manually controlled. is turned to the position shown in Figure 2, air will be drawn in the can buretor at 13, flowing downwardly through the carburetor. thence through the registering ports 18 and 29, passing downwardly around theoutside ol the mixing tube 27, thence around the flange 30 it will be (leflected by the edge30" upwardly between the bottom of the tube and the mouth 20 of the nozzle 19, in a line towards the ring meanwhile mixing with the fuel issuing from the nozzle, and then flowing upwardly through the mixing tube, thence through the chamber 38 within the sleeve valve 12.

It will be understood that with the sleeve valve in this position, the edge 30" of the flange 3U ('O-OPCl'ilt-lll with the deflector ring 35 will tend to direct most of the incoming air closer to the mouth 20 of the fuel nozzle 19, than would be the case if only an imperforate lifting plate, such as 34, were provided. It will be understood that a large portion of the air is drawn upwardly through the opening 39 on the inside of the ring thence laterally through the space 40 between the bottom 34 of the lifting plate and the ring. As the throttle is opened, or the suctionof the motor is increased, and the velocity of the incoming air is also increased, the force directed against the bottom of the plate 34 will be foundsufiicient to lift the sleeve valve 12, thus gradually enlarging a port 41 between the bottom of the sleeve valve 12 and the top 42 of the strangle tube, and forming an intake for auxiliary air. limit for the upward movement of the sleeve valve 12 is provided in the form of. an in wardly extending annular flange 4C3, formed in the tube 11. It will also be understood that by bending the ring 35 away from the nozzle or towards it the mixture may be made leaner or richer, as desired, for certain positions of the plate 34 or its valve mechanism.

It will be understood that after the plate 34 and the choke ring 35 have moved for a slight distance upwardly, the deflector ring will have little or no effect, independent of the plate 34, on the flow of air upward in the mixing tube 27; that is, this ring is adapted to function only when the primary air velocity is very low, such as during substantially closed throttle positions By means of the rotatable or mixing tube 27, causing a change of registration of the ports 18 and 29, the quantity of primary air may be varied for leaning or enriching the mixture for the carburetor, as desired. This may be done without depreciably affecting the functioning of the auxiliary air valve 12.

I. have shown the choke ring 85 as bent downwardly to provide an increased open ing 40. but it is not essential that the ring be so shaped. and while I have described and illustrated what I deem to be a preferred embodiment of my invention, various modifications and changes may be made. by one skilled in the art. without departing from the spirit and scope hereof.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a carburetor, the combination with a mixing chamber, a fuel nozzle arranged therein, said mixing chamber having primary and secondary air ports, means comprising a movable plate arranged in said chamber for directing a greater proportion of the total quantit of incoming primary air towards the si'es of the chamber as said plate approaches said nozzle, and means movable with said plate for directing the flow of said incoming primary air towards said nozzle when said plate is in its position closest to said nozzle.

2. In a carburetor, the combination with a mixing chamber, a fuel nozzle arranged therein, a throttle, means for supplying primary air to said chamber including an upwardly flaring strangle tube the lower end of which surrounds and is spaced from said nozzle, means for supplying secondary air to said chamber including a vertically slidable air valve and a suction operated plate positioned in said strangle tube for lifting said valve, and means co-operative with said plate operating when the throttle is nearly closed for increasing the suction at the nozzle.

3. In a carburetor, the combination of a mixing chamber, a fuel nozzle arranged therein, said mixing chamber having primary and secondary air ports, means com prising a movable plate arranged in said chamber for directing a greater proportion of the total quantity of incoming primary air towards the sides of the chamber as said plate approaches said nozzle, and a deflector ring carried by and spaced apart from said plate for directing incoming primary air towards said nozzle as it approaches the same.

4L. In a carburetor, the combination of a mixing chamber, a fuel nozzle arranged therein, said mixing chamber having primary and secondary air ports, a valve device for said secondary port, a tube arranged in said chamber taperin towards said nozzle, a plate arranged within said tube and connected to said valve device and adapted to be actuated by the flow of air through said tube, and a ring member carried by and spaced apart from said plate for directing the incoming primary air towards said nozzle as said plate approaches the same.

5. In a carburetor, the combination of a mixing chamber, a fuel nozzle arranged therein, said mixing chamber having primary and secondary air ports, a valve device for said secondary port, a tube arranged within said chamber tapering towards said nozzle, and provided with a deflector portion adjacent its lower end for directing the in coming primary air towards the center of said tube, a plate arranged within said tube and adapted to be actuated by the flow of air through the same, and means arranged on said plate and co-operatin with said deflector portion for directing t e incoming primary air towards said nozzle when said plate is in its position closest thereto.

6. In a carburetor, the combination of a mixing chamber, a fuel nozzle arranged therein, a mixing chamber having primary and secondary air ports, a valve device for said secondary port, a downwardly tapering tube arran ed in said chamber, a plate arranged wit in said tube adapted to be actuated by the air flowing therethrough and to operate said secondary valve, said tube having a deflector flange arranged therein adjacent said nozzle, and adapted to direct the incoming primary air towards the center thereof, and a ring carried by and spaced apart from said plate and oo-operating with said deflector flange for directing a greater proportion of the total quantity incoming primary air towards said nozzle as said plate approaches the same.

In testimony whereof, I afiix my signature.

FRED E. ASELTINE. 

